Well I have search and hunted and can't figure this out. I have to replace the tranny in my blazer(cooler line wore and front driveshaft while playing in snow and pumped all fluid out burnt it up). Can I buy a tranny say from JEGS (ask about this because you can get a 2.75 first gear TH400) and just changed the output shaft (if it is needed)? Or do I have to purchase a tranny specific for a Four Wheel drive. The way GM shares everything else would think just the tailshaft is different. Anyways I digress. so? Thanks for any answers.